def __init__(self, pos, sheet, frame_width):
SimpleSprite.__init__(self, pos, sheet)
self._sheet_width = self._width
self._sheet = self.image
self._frame = 0
self._frame_width = frame_width
self._width = self._frame_width
self._update_image()
self.rect = pygame.Rect(0, 0, self._width, self._height)
self._num_frames = self._sheet_width // self._frame_width
def __init__(self, pos, sprite_sheet=None, frame_width=None):
SimpleSprite.__init__(self, pos)
self._frame = 0
if sprite_sheet:
self.set_sprite_sheet(sprite_sheet, frame_width=frame_width)